(CNBC) — Germany’s resistance to a banking union and stimulus measures is in the way of a solution to Europe’s debt crisis, and could turn this week’s meeting of the region’s leaders into a “fiasco”, according to billionaire investor George Soros.

German Chancellor Angela Merkel has so far rebuffed all proposals to help relieve Spain and Italy from the jump in their borrowing costs and has resisted allowing the European Central Bank (ECB) [cnbc explains] to step up buying of peripheral sovereign debt. That poses a threat to the region’s stability, Soros said in an editorial in the Financial Times on Monday.

“This threatens to turn the June (28) summit into a fiasco which may well prove fatal because it will leave the rest of the euro zone without a strong enough firewall to protect it against the possibility of a Greek exit,” Soros wrote.

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